Difficulty Tweaks by Lothrazar
Adds a bunch of small tweaks to the game that are all aimed at increasing the difficulty of the first few days. You cannot punch trees; you must turn saplings into sticks, and sticks into a damaged wooden axe. All stone tools require smoothstone instead of cobblestone. Furnace requires one coal in center to craft (so you may not get a furnace or stone tools on your first day; try making wooden tools and finding food first). You cannot gather dirt, grass, sand, clay, or gravel by hand (you can still break them by hand, but need a shovel to harvest the block). Sleeping in a bed will drain your hunger down and also gives you the rotten flesh hunger effect.
Ben's Alert Mod by Ben
A simple mod to display a message in the bottom right corner of a players screen when the command /alert "title" "message" is executed. Can be used by mods as an alternative to chat.
Vertically Stacked Dimensions by CD4017BE
Effectively increases the Build height by stacking dimensions above each other with transition portals in between.
InWorldCrafting by xt9 (IterationFunk)
Crafttweaker integration that lets you craft in the world with Fluids, Fire or Explosions.
Extra Craft by SlimeNamedJerry (SNJ)
Heres Some Extra Tools And Handy Gadgets To Make This Already Cool Game Interesting! If Your Reading This You Probably Have Downloaded The Mod, I Hope You Like It, And Thanks For The Support. Leave A Comment On The Forums!